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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f355477e4b3532917c6ae4d17573b9da2bc455f6b2ba9cbdb0737b30ae707d' 
  AND token = 'MJgqkvI5KNuRI0C0Z06YFK4fvFbPCHu/SR9e3NqaGI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}